Add build classes for unit tests to use

.github/workflows/ci.yml

@@ -26,6 +26,8 @@ jobs:
           python -m pip install --upgrade pip
           pip install --upgrade -r build_requirements.txt
       # Run our unit tests
+      - name: Run shell script
+        run: ./build_classes_from_xsds.bsh
       - name: Run unit tests
         run: |
           python -m pytest -s